FIX. RadGridView - expression set to FilterDescriptors collection is not parsed correctly when grid is in hierarchy and self reference

How to reproduce:
Create a grid in self referencing hierarchy and set up a filter expression like this:
this.radGridView1.FilterDescriptors.Expression = "Name = \"bin\" AND (FileSystemInfoType = \"Folder\" OR Id = \"2\")"
Immediately after the expression is set, the OR logical operator is substituted with AND